【ARM-Linux开发】ARM板卡上QT显示中文

int id = QFontDatabase::addApplicationFont("/usr/lib/fonts/DroidSansFallback.ttf");
QString msyh = QFontDatabase::applicationFontFamilies (id).at(0);
QFont font(msyh,10);
qDebug()<<msyh<<endl;
font.setPointSize(20);
app.setFont(font);